 /*******************************************************************************
  * Copyright (c) 2006, 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.core.internal.databinding.observable.tree;

 /**
  * Describes the difference between two trees as a tree of tree diff nodes.
  *
  * @since 1.1
  *
  */
 public abstract class TreeDiff extends TreeDiffNode {

     /**
      * Returns the tree path (possibly empty) of the parent, or
      * <code>null</code> if the underlying tree is not lazy and never contains
      * duplicate elements.
      *
      * @return the tree path (possibly empty) of the unchanged parent, or
      * <code>null</code>
      */
     public abstract TreePath getParentPath();

     /**
      * @param visitor
      */
     public void accept(TreeDiffVisitor visitor) {
         doAccept(visitor, getParentPath());
     }

 }

